102 lines
3.5 KiB
Java
102 lines
3.5 KiB
Java
/*
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* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 4652911
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* @summary test Hashtable readObject for invocation of overridable put method
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*/
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.Serializable;
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import java.util.Hashtable;
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/**
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* Class that extends Hashtable to demonstrate bug when
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* subclass wraps the values put into the Hashtable.
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*/
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public class ReadObject extends Hashtable {
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/**
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* Wraps the values put into MyHashtable objects
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*/
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class ValueWrapper implements Serializable {
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private Object mValue;
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ValueWrapper(Object value) {
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mValue = value;
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}
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Object getValue() {
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return mValue;
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}
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}
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public Object get(Object key) {
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ValueWrapper valueWrapper = (ValueWrapper)super.get(key);
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Object value = valueWrapper.getValue();
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if (value instanceof ValueWrapper)
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throw new RuntimeException("Hashtable.get bug");
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return value;
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}
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public Object put(Object key, Object value) {
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if (value instanceof ValueWrapper)
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throw new RuntimeException(
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"Hashtable.put bug: value is already wrapped");
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ValueWrapper valueWrapper = new ValueWrapper(value);
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super.put(key, valueWrapper);
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return value;
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}
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private static Object copyObject(Object oldObj) {
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Object newObj = null;
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try {
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//Create a stream in which to serialize the object.
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ByteArrayOutputStream ostream = new ByteArrayOutputStream();
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ObjectOutputStream p = new ObjectOutputStream(ostream);
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//Serialize the object into the stream
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p.writeObject(oldObj);
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//Create an input stream from which to deserialize the object
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byte[] byteArray = ostream.toByteArray();
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ByteArrayInputStream istream = new ByteArrayInputStream(byteArray);
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ObjectInputStream q = new ObjectInputStream(istream);
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//Deserialize the object
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newObj = q.readObject();
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} catch (Exception ex) {
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ex.printStackTrace();
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}
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return newObj;
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}
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public static void main(String[] args) {
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ReadObject myHashtable = new ReadObject();
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myHashtable.put("key", "value");
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ReadObject myHashtableCopy = (ReadObject)copyObject(myHashtable);
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String value = (String)myHashtableCopy.get("key");
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}
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}
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